I was looking for a recipe without ricotta cheese to make for my Dad. I doubled the recipe and used 1/2 ground beef and 1/2 Italian sausage. Instead of shredded mozzarella cheese I used the fresh soft mozzarella balls. They are too soft to shred so I diced them. I put a thin layer of sauce on the bottom of the pan before putting the filled shells in. I put a cube of diced mozzarella in each shell before filling with meat mixture. These came out really good. Thanks for the recipe:)